@jfrmusic As another data point, I have one AHB2 for my Focal speakers. I like the AHB2 at this stage in my path, but it is not be for everyone. I have been considering a second AHB2 and enjoy trying different arrangements and listening for differences. I tried the AHB2 in bridged mode and vertically passively bi-amped, as well and the usual stereo configuration with the jumper, all using just one amp into one speaker. The sessions were relatively short and I don’t have golden ears, nor extensive experience. All were with a 10’ speaker cable.
I feel somewhat confident that I found the bridged mode to sound worse. This is not what I was expecting. There was less detail across the board and the bass was less controlled as compared to traditionally stereo but with one channel powering the entire speaker with the jumper. I am assuming this is due to the damping factor with the same speaker cable length. A much shorter speaker cable would improve the damping factor.
I believe the vertically biamped sounded better than the traditional connection (one channel of the amp power the entire speaker with the jumper across the speaker posts). The bass had the same impact, maybe a bit better however across the board there was more detail and clarity. I focus on detail, and don’t try to make it louder. I prefer about 75 to 85 db. I would need to listen alot more over various days and bring in friends/family to say with certainty, but these are my impressions so far, for my ears, on those days, in my room.